银精矿在BmimHSO4离子液体—硫脲体系中的浸出行为.doc

银精矿在[Bmim]HSO4离子液体—硫脲体系中的浸出行为 方夕辉1，钟名清1，尹艳芬2，张帅1，陈杜娟3 (1.江西理工大学 资源与环境工程学院江西赣州 341000；2江西理工大学 经济管理学院江西赣州 341000； 3西北矿冶研究院甘肃白银 730900) 摘要：用[Bmim]HSO4离子液体取代硫酸进行了硫脲浸取银精矿的浸出行为研究。考察了磨矿细度[Bmim]HSO4浓度硫脲浓度Fe3+浓度液固比浸出时间等对银浸出率的影响。结果表明，在磨矿细度-0.043 mm占80%、硫脲浓度0.18 mol/L、[Bmim]HSO4浓度0.3 mol/L、Fe3+浓度7.5mol/L、液固比31、浸出时间18 h的最优条件下，银浸出率可达到73.96%。[Bmim]HSO4-硫脲H2SO4-硫脲氰化[Bmim]HSO4-硫脲体系不但银浸出率最高，而且浸出时间短。 关键词：[Bmim]HSO4；离子液体；浸出；硫脲；银精矿中图分类号：TF8 文献标志码：A 文章编号：1007-7545（201）05-0000-00 Leaching Behaviors of Silver Concentrate in [Bmim]HSO4 Ionic Liquids and Thiourea Solution FANG Xihui1, ZHONG Ming-qing1, YIN Yan-feng2, ZHANG Shuai1, CHEN Du-juan3 (1. Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China; 2. Faculty of Economics an Management, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China; 3. Northwest Research Institute of Mining and Metallurgy, Baiyin 730900, Gansu, China ) Abstract: The leaching behaviors of silver concentrate in [Bmim]HSO4 ionic liquids and thiourea solution were studied. The effects of grinding fineness, [Bmim]HSO4 concentration, thiourea and Fe3+ concentrations, ratio of liquid to solid, and leaching time on silver leaching rate were investigated. The results show that silver leaching rate is 73.96% under the optimum conditions including particle size of 80% -0.043 mm, thiourea concentration of 0.18 mol/L, [Bmim]HSO4 concentration of 0.3 mol/L, Fe3+ concentration of 7.5 mmol/L, ratio of liquid to solid of 3∶1 and leaching time of 18 h. In comparison with cyaniding leaching and sulfuric acid thiourea leaching, the highest silver leaching rate can be achieved in [Bmim]HSO4-thiourea solution with the shortest leaching duration. Key words: [Bmim]HSO4 ionic liquid; leaching; thiourea; silver concentrate 离子液体是指在室温条件下呈液态的离子化合物具有没有显著蒸汽压较宽的电化学窗口优良的选择性溶解能力和易于再生等独特的优点[12]。已有的研究表明，离子液体在铝镁钛镍等金属的电沉积硫化铜的浸取等领域已获得应用[3-5]，若能将离子液体应用于金银的提取，再将浸出的金银在离子液体中直接电解或者电沉积出来，解决金银提取尤其是银浸出率低和环境污染问题